Metrohm 780 - Standard and Sample Addition (781 Only: Conc Mode); Standard; Sample Addition

6.6 Standard and sample addition (781 only: Conc mode)
80
780/781 pH/Ion Meter, Manual
6.6 Standard and sample addition (781 only: Conc
mode)
In the ion measurement Conc mode a differentiation is made between
direct measurement and the standard or sample addition and subtrac-
tion methods.
All the method parameters for direct concentration determination are
described in Section 6.5. The descriptions of the ion parameters,
measuring parameters and calculation parameters given there
also apply to the
standard addition
and
sample addition
types of ion
measurement. This is why this section contains only the method pa-
rameters which apply only to these types of measurement.
PARAMETER Conc
├ meas.type
:
meas.type: direct, std.add, smpl.add
The measurement type describes the analytical principle of ion meas-
urement. Select '
std.add' if the analysis is to be carried out accord-
ing to the standard addition method, i.e. by the addition of defined
standard solutions to the sample. For the sample addition method, the
multiple addition of the sample solution to a standard solution, select
'
smpl.add'.
Please note that changing this Conc parameter
meas.type
does not in-
clude a change of the current method. Within the mode Conc a method
contains all parameter settings.
6.6.1 Standard / Sample addition
PARAMETER Conc
:
├ standard addition / sample addition
: ├ type
├ conc.std.
├ report
└ addition ┬ manual ┬ no.of additions
│ ├ increment 1...n
│ └ stop V
├ auto dos ┬ dos.rate
│ ├ no.of additions
│ ├ V Exchange Unit
│ ├ increment 1...n
│ └ stop V
└ auto ┬ delta U
├ dos.rate
├ no.of additions
├ V Exchange Unit
└ stop
V
The exact technique of standard and sample addition in the Conc
mode is described by the parameters selected under
standard addi-
tion
and sample addition: